[NAME, COMPANY AND ADDRESS, ex.
John Smith
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]
 

Dear [NAME, ex. John Smith], 

I was quite upset to hear of your recent accident.  In fact, the news was very disconcerting to me.  I am confident, nonetheless, that your strength and vigor will lead to a quick recovery.  Please accept, then, my sincerest wish that you get better soon.

Sincerely,
 

[YOUR NAME, ex. Jill Jones]